<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/img/logo.png" alt="">
      </div>
      <!-- 登录表单 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data(){
    return {
      // 这是登录表单的数据对象
      loginForm:{
        username:'admin',
        password:'123456'
      },
      // 这是表单的验证规则对象
      loginFormRules:{
        // 验证用户名是否合法
        username:[
          { required: true, message: '请输入用户名', trigger: 'blur'},
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password:[
          { required: true, message: '请输入密码', trigger: 'blur'},
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods:{
    // 点击重置按钮，重置登录表单
    resetLoginForm(){
      this.$refs.loginFormRef.resetFields()
      // console.log(this)
    },
    login(){
      this.$refs.loginFormRef.validate(async valid => {
        if(!valid) return;
        const {data:res} = await this.$http.post('login',this.loginForm);
        if(res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功');
        // 1.将登录成功知乎的token，保存到客户端的sessionStorage中
          // 1.1 将目中除了登陆之外的其他api接口，必须在登录之后才能访问
          // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
          console.log(res)
          window.sessionStorage.setItem('token',res.data.token);
        // 2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    height: 100%;
    background-color: #2b4b6b;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 5px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
  }
  .avatar_box{
    width: 130px;
    height: 130px;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
      img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
  }
  .login_form{
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
    position: absolute;
    bottom: 0;
  }
  .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>